Mechanical power



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- E. B. JONES.

A i MECHANICAL POWER. v No. 307,308. Patented ont. 28, 1884.

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vMiren @rares .avenir 'erica IEPER-AIM B. JONES, OF PITTSBURG, PENNSYLVANIA.

MECHANICAL POWER.

SPECIFICATION forming part or' Letters Patent No. 307,308, dated October 28, 1884.

Application filed May QQ, ISS-1. Y (No model.)

To all whom, 'it may concer/t:

Be it known that I, Ernnliiir B. J'oNns, ol' Pittsburg, in the county of Allegheny, State of Pennsylvania, have invented a new and useful Improvement in Mechanical Iower i'or Elevators; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature ol" my invention consists in the Vcombination et' two series ot' piilleys, rope 0r chain, toggle-levers, sliding head, and operating-screw, said mentioned parts constructed, arranged, and operating with relation to each other as will hereinafter more fully and at large appear. l

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

Figure l is a side elevation of my improvement. Fig. 2 is an end elevation of the same. Fig. 3 is a top view or plan ofthe same.

Reference being had tothe accompanying drawings, A represents the frame l'or the me- -chanieal power, which consists of the screw B or other motorpl'or imparting motion to a sliding head, (l, said screw being fitted to screwthreads in said sliding head. n each side of the sliding head C are two trunnions, m, ou which are pivoted levers D I) D D, two of said levers being arranged. on each side ot' said sliding head. In the Aforward endet' the upper and lower pairs ot' the levers D Dare journaled shal'ts L and IX. On the shaft Il is arranged on the outside ol" the leversD D loose ilanged pulleys J, and between said levers loose grooved pulleys Il) F G- II. In the forward end of the upper pair of levers D D is journaled shaft Il, on which in like manner is arranged loose flanged pulleys J and loose grooved pulleys llF llI. The vertical bars l II of the frame A on their inner edge are provided with inclines o o. (Clearly shown The screw B is provided with a hand-wheel, n, i'or turning said screw, and the sliding head C is provided on each side with recesses, into which is litted guides p, secured to the side pieces of the frame A. The rope or chain g is attached to the frame A or other stationary thing, and is then passed under the pulley D, up over the pulley Ef, and then down under the pulley Fand then up and over pulley F', then down and under the pulley G, and then up and over the pulley G', and then down under the pulley I-I, and then up and over the pulley II', and attached to the elevator or other thing to be manipulated. In the present case a weight, lV, is represented attached to the rope.

The skillful mechanic lwill be enabled from the foregoing description and reference had to the accompanying drawings to construct my improvement in mechanical power. I will therefore proceed to describe its operation, which is as follows: The screw B is revolved through the medium ol the hand-wheel n. The

revolving oi' the serewB will cause the sliding head C and toggle-levers D D D D to move forward, as indicated by the arrow marked 1'. The pulleys J J, moving on the inclines o 0,will cause the toggle-levers to spread, thereby causing the shafts LL to move in opposite direetion. By moving Jche screw B in opposite direction said shaft and pulleys will be moved toward each other. By these two movements ofthe screw B the weight lV will be elevated by the first-mentioned movement andlowered by the second-mentioned movement of said parts, and said weight or other thing will be elevated sixteen times the distance that the screw D travels-that is to say, for every foot of travel ot' the sliding head C the weight W' will be elevated or lowered sixteen feet.

.ly the combination of the inclines o 0 with the toggle-levers D D D D the power of the wedge will be combined with that ofthe tog gle-lever and screw Il, so that in the starting olt' of the machine or power herein described the inclines o o will greatly increase the power ofthe machine at the starting-point, so that the lost power eonnnon to the employment of toggle-levers when the levers are brought together is obviated, it being a well-known fact that the toggle-levers increase in power as they approach a straight line,and lose power as they recede from. a straight line; hence the advantage of the inclines 0 o. In elevating or lowering, the trzrvel of the pulleys on arranged, und opera-ting with relation to ezreh shulJ between thetoggle-leversDDinereuses other substantially as herein described, :ind

in speed consecutively. for the purpose set forth.

Having thus described my improvement, E. B. JONES. 5 what I claim is- Vitiiesses:

The combination o f a screw. sliding` head, A. C. JOHNSTON, pulleys7 inelines7 and rope or chain, combined, i C. S. JOHNSTON. 

